I’m an advanced nature & wildlife photographer. When I go out to shoot I normally come back with 400 to 800 shots for I shoot at high speed bursts of birds in flight. The first thing I do is take that camera card out and immediately transfer it to my dedicated external hard drive. From there, I then import all to Lightroom to start editing. I had been using for the last 3 years a multiple Insignia card reader and was used to its normal pace. When it finally broke up I started looking for a different product that would seem better built. PRoGrade info came up on my screen and I liked what I read, so decided to give it a try. I bought the Compact Flash dual reader. Opening the box was a nice surprise for even the packing felt like super quality. I inserted both my cards - one of them loaded with video and the second one with over 300 frames- I shoot Canon 7DMk2 and suddenly Wham! Holy Cow! The speed of the transfer caught me by surprise! Used for years to the small, slow Insignia, I was delighted with this product. I love even the way it feels to handle it. It is just a great product.. plus, the service of this company is THE BEST. I am now a totally convinced ProGrade fan. Get their products. You will not be disappointed.